Vacuum jet and system of operating the same



T. L. DAVENPORT.

VACUUM JET AND SYSTEM 0F OPERATING THE SAME.

APPLICATloN FILED 1511.25, 1919. RENEwED 111111.31, 1921.

1,423,198. Patented July 18, 1922.

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F awr-E- 6 fr l lNvENToR UNITED STATES PATENT orifice.

THOMAS L. DAVENPORT, or nvnnn'r'r, WASHINGTON VACUUM JET AND SYSTEM OF OPERATING THE Application nled February 25, 1919, Serial No. 279,200. Renewed March 31, 1921.

To all whom t may concer/n.'

Be it known that l, THOMAS L. DnvnN- ron'r, citizen of the United States, residing at Everett, in the county ot' Snohomish and State of Washington, have invented a certain new and useful improvement in Vac uum Jets and Systems of Operating the Same, of which the following is a specification.

My invention relates to improvements in vacuum jet pumping systems and is an improvement of the vacuum jet pumping system disclosed in my prior United States Let ters Patents No. 1,152,302, issued to me Augen si, 1915, mi No. 1,180,017, issued April 18, 1916; and the object of my invention is to improve and simplify the construction and render more etlicient the operation of a vacuum jet pumping apparatus.

A Jfurther object oi. my invention is to construct a vacuum jet that `is formed o'f units or sections so that any desired number of the units may be used. and to construct a jet wherein the variousparts in the several units are of simple and uniform construction so that they are interchangeable.

A still further object of my invention is to provide novel and e'flicient controlling mechanism for use in combination with the vacuum jet that is adapted to operate automatically to shut oil the 'flow of the fluid from which the power is derived when the degree of vacuum.v Within the jet reaches a predetermined maximum.

My invention consists in the novel construction olf a vacuum jet and in the adaptation and combination therewith of an automatic control for regulating the flow of vfluid under pressure through said vacuum et. J I accomplish these objects by devices illustrated in the accompanying drawings, wherein* Figure 1 is a view in vertical cross-section of a vacuum pump and automatic control therefor certain part-s being shown in elevation;

Fig. 2 is a view in cross-section on broken' Specification of Letters Patent.

Serial No. 457,431.

'5 is provided with a shutoff valve 6 and the top end thereof is externally threaded to screw within an internally threaded boss on a cap 7, which cap 7- is internally threaded to screw over the externally threaded lower end of a tubular member 8.

The upper end of the member 8 is externally threaded and is connected by an internally threaded' coupling 10 with the e3:- ternally threaded bottom end ot another tu bular member 11 that is provided on its top end with a cap 12 similar to the cap 7 that is connected with' an inlet pipe 18.

The member 11 is enlarged as at 9 and is provided on one side of the enlarged portion with an internally threaded boss for the reception of an inlet pipe 19 through which lluid under pressure, as steam, may be admitted to the jet.

Both ends ol each of the members 8 and 11 are internally counterbored as at 14 to provide seats for flanges 15 and 16 on the end of the tubular members 17 and 1S, as shown in Figs. 3 and 4, that are adapted to be inserted within the members 8 and 11.

The tubular members 17 and 18 are of smaller diameter than the internal bore of the members 8 and 11 so that a passageway 2O is left therebetween.

The end of each tubular member 17 opposite the flange 15 is externally beveled or tapered as at 21 and the end of each tubular member 18 opposite the `itlange 16 is internally beveled or flared as at 22 so that when a section of the device is assembled the tapered end 21 of the member 17 will project within thel lared end 22 of the memberl as shown in Fig. 1 and a relatively narrowV annular passageway 28 will be left therebetween.

The coupling'l() is provided with a transverse wall 24 that is slotted as at 25 and provided with a concentric opening 2G that registers with the openings in the tubular members 17 and 18, the flanges 15 and 16 are also slotted as at 27 to afford passageways that register with the slots 25 and permit fluid to pass from the jet 11 to the jet 8.

In assembling a pump consisting of two sections as shown in Fig. 1 one of the tubular members 18 is inserted into the botom end of each of the members 8 and 11 and one of the tubular members 17 is inserted into the top ends thereof and the two members 8 and `into the coupling 11 are secured together by screwing them member securely against the wall 24. The caps l and 12' are `then screwed on to the outer endsI oi" the several tubular members 1T and 1c will be held in accurate alignment with the tapered ends of the members 17 projecting` into the flared ends oi the members 18 and evenly spaced therefrom to torni the annular passageways 23, Y

From the above description it will be seen that the several parts that go to malte up this vacuum jet pumping` apparatus are relatively simple and uniiorm construction and are interchangeable with respect' to the different sections ot the apparatus.

it will be seen that the several parts are so constructed that a continuous passage way ot substantially constant cross-sectional area is formed within the members l? and 13 while an annular pasageway ot sub stantially constant area is 'formed around th-e outer walls ot such members below the enlarged section 9 of the jet member 11.

nterposed within the supply pipe 19 is a strainer composed ot a dislr ot perforated material or wire netting 30 that is clamped.

etween two flanged members t1 and-3.J ot coneavo-eonvexV torni which serves to prevent oreign mattei.V trom getting into the I vacuum j ets;

Yopen the pressure of the fluid that rlhe toregoing` description has been conined to the vacuum jet pumpinp apparatus and will new proceed to describe the control mechanism that is associated therewith. rlie upper end of the pipe 13 is connected with the bottom end ot a T-shaped valve housing 33 that is internally-provided withan angularlyfpositioned valve seat 34 and with flap valve 35 that is pivoted as at 36 and connected'by a linlr 3'? with the inner end voi" a piston rod 33 which passes through a stutiing box 40 and is secured to piston 41 f in a cylinder 42. A

rllhe end of the cylinder 42 is connected by a pipe 43 with a valve 44 which vvalve isv in turn connected by a pipev 45 with the inlet pipe 19 so that when the valve 44 is is passing through the inlet pipe 19 may'cn'ter the cylinder 42, move the piston 41 to the lett from the position shown in 1 and close the tlap valve p Theupper endet the valve casing'33 is connected with a pipe 46 which may in turn be connected with any suitable term olf den vices, not shown, through which a suction ist@ be produced.

inea-ice The pipe 19 is provided with a valve housing` 4( within which is slidably mounted a 1frate valve 48 that is rigidly connected with a piston rod 50 that passes upwardly through a packing gland 51 and iS connected with a piston 52 in a cylinder 53.

rhe top end of the cylinder 53 is connected with a pipe 54 which in turn is connected by means ot a T-tting 55 with the pipe 43 so that when pressure is admitted to move the flap valve 35 the gate valve 48 will also be moved.`

The gate valve 43 may be normally held in a raised position by a spring 56 on the piston rod 50.

rlhe opening and closing of the valve 44 is ctlected by an arm 5"( that is connected by a link 58 with the top end ot a piston rod 6() whose bottom end secured to a Vpiston 61 that is disposed within a cylinder 62 that is open at one end.

The piston rod has a compression spring 63 provided the een which is interposed between an adjustable nut 64 on the `V This device is adapted for anyiuse to which a vacuum pump may be put and has been successively used tor operating vacuum cleaners and also 'tor pumping' sand and avel and tor renioving ashes' from ash p ts and like places. Y

46 is Connected with the nozzles `or outlets 'tl rouoh which a suction is to be produced and huid under pressure, as steam or compressed air, is admitted through the pipe 19 to the passageway 2O and 'is directed at aV highV velocit-y through the passageways 23 and downwardly through the tubular members 17 and 13 to the discharge pipe 5 there# by creating a suction through the pipe 46.

rrllhe suction produced by the two jets working in tandem has been found in practice to .be substantially twice as great asthe suction ot one jet working alone.

lt the vacuum in the pipe 46 reaches a undetermined maximum so that the pressure in the cylinder 62 drops sufficiently to permit the pressure of the air on the top of the piston 61 to move the piston 61 and pis-V ton rod 60 downwardly and open the valve slightly then the `gate valve 48 will be moved downwardly to partially close the passageway through. the pipe 19 and retard the inlet of steam until only enough to; produce thedesired vacuum is passing therethrough.

,lt the vacuum in the pipe becomes less the spring 63 will serve to open the gate Vlin the operation ot this device vthe pipe lio valve 48 and admit more steam to the vacuum jets.

It will thus be seen that the control mechanism serves to decrease the flow of the actuating medium when the desired vacuum is reached or exceeded and further serves to increase the flow of actuating medium when the vacuum is not as great as desired.

The control feature is especially advantageous and tends to conserve energy where several outlets are connected with the pipe 46 and each operated and shut ofl' and turned on independently so that different numbers of these outlets may be actuated by the jet at different times.

Obviously changes in the form of con struction of this device may be resorted to within the scope of the following claims.

That I claim is:

l. A vacuum jet of the class described, comprising an outer casing having a Huid inlet passageway and provided with a cylindrical passageway therethrough that is counterbored at each end to form a seat, a tubular member having an annular flange on one end adapted to lit within the seat in one end of said casing to center said tubular member within said casing the inner walls of the end of said tubular member opposite said flange being flared, another tubular member having an annular flange on one end adapted to lit within the seat in the opposite end of said casing said other tubular member having a tapered end adapted to project within the flared end of said first named tubular member so that a. narrow annular space is left therebetween, caps on the ends of said outer casing and adapted to engage with and hold said tubular members and inlet and outlet pipes connected with said caps.

2. A vacuum jet pumping apparatus, comprising a plurality of vacuum jets adapted to be secured together in end to end relation each of' said jets comprising an outer casing provided with a cylindrical passageway that is counterbored at each end to form a seat, a tubular member having a perforated flange on one end adapted to lit within the seat in one end of said casing said tubular member being of less diameter than the cylindrical passageway within said casing whereby an annular passageway is left therebetween when the tubular member is projected into the cylindrical passageway and said tubular member having its inner walls beveled to form a flaring end that is directed toward the intake end of said jet, another tubular member having a perforated flange on one end that is adapted to fit within the seat in the opposite end of said casing said last named tubular member being of substantially equal diameter toA said first named tubular member and having its outer walls beveled to form a tapered lower end that is adapted to be projected into the flaring end of said rst named tubular member in concentric relation thereto to leave a narrow annular passageway therebetween, a delivery conduit connected with the outlet end of said series of vacuum jets, an intake conduit connected with the inlet end of said series of vacuum jets and a pipe adapted to conduct fluid under pressure into the annular passageway'between the Walls of said tubular members and the walls of said vacuum jets.

3. A vacuum jet pumping system comprising a plurality of vacuum jets adapted to be secured together in end to end relation the main passageway through each of which is substantially cylindrical so that the combined passageway through all of said jets will be of substantially constant cross-sec tional area, a delivery conduit connected with the outlet end of said series of vacuum jets, an intake `conduit connected with the inlet end of said series of vacuum jets, a supply pipe adapted to conduct fluid under pressure into said jets, a gat-e valve interposed in said supply pipe, and automatic means associated with said gate valve and said intake conduit whereby the flow of fluid through said supply pipe shall be varied in response to variations in the reduced pressure of fluid within said intake conduit.

ln witness whereof, I hereunto subscribe my name this 15th day of February, A. D.

THOMAS L. DAVENPORT. 

